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  #11  
Old 21st July 2008, 11:46 PM
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pre65 pre65 is offline
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Default Re: Millenium 4-20 (Maplin Electronics)

Hi Al-the Mullard book "tube circuits for audio amplifiers" gives a very detailed account of the 5-20 amp workings/construction and has details of the tag boards and their layout.

My copy is in very good condition which makes it difficult to scan properly but i will give it a go if you want a copy.

Just PM me your e-mail address.

Philip

ps 5-20 has valve rectifier
4-20 has SS rectifier
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  #12  
Old 21st July 2008, 11:55 PM
alnewall alnewall is offline
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Default Re: Millenium 4-20 (Maplin Electronics)

Phil.

I don't want you to ruin the book. I'll have a look on the net first. I found some 4-20 circuits ages ago but they were all different and none exactly like mine.
If your book has a tag layout that would be good, and save a lot of time.

Cheers.
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  #13  
Old 22nd July 2008, 08:36 AM
Richard Richard is offline
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Default Re: Millenium 4-20 (Maplin Electronics)

Quote:
Originally Posted by alnewall View Post
Richard.

Do you have the 5881 diagrams?
I quite fancy hardwiring my Maplin amp one of these days. I think the original output TXs were the weakest link here, do we know of anyone who's bothered to fit something better?

Hi Al, Philip,

Here's the original 5881 supplement article which covers layout saved as pdf.

I had a pair of Matamp 5-20 monoblocs which used larger (than standard Maplin) opts from Danbury. Superb sound.

I think the psu was a limiting factor also with more power available using 2 psus for the Maplins. I have the project books if you need any info.

Rich
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  #14  
Old 22nd July 2008, 10:34 PM
alnewall alnewall is offline
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Default Re: Millenium 4-20 (Maplin Electronics)

Thanks Richard.

I'm thinking ahead here. A nice little project for the winter perhaps.
I've done a few alterations to my 4-20, and i've lost track of whats been done.
If i hardwire it, and do the necessary mods to the power supply and iron; i suspect there won't anything left of the original amp.
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  #15  
Old 22nd July 2008, 11:12 PM
colin.hepburn colin.hepburn is offline
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Default Re: Millenium 4-20 (Maplin Electronics)

Hi All
I believe the name who built the 4.20 for maplin Mike I think has a wedsite for the transformers and some parts for the 4-20 plus some updated schematics but he must be updating his site at the moment as it has been down for the last week unless anyone knows different the link I have is
http://www.livinginthepast.demon.co.uk/xformer.html?amplifiers_summary.html
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  #16  
Old 22nd July 2008, 11:14 PM
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pre65 pre65 is offline
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Default Re: Millenium 4-20 (Maplin Electronics)

I had trouble with Mikes web site so i e-mailed him and it seems the address has changed slightly.

This link works

http://livinginthepast.demonweb.co.uk/valveaudio.html
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  #17  
Old 22nd July 2008, 11:19 PM
colin.hepburn colin.hepburn is offline
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Default Re: Millenium 4-20 (Marlin Electronics)

Ah thats got it
cheers Phillip
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Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s
Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2


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  #18  
Old 23rd July 2008, 08:02 PM
colin.hepburn colin.hepburn is offline
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Default Re: Millenium 4-20 (Marlin Electronics)

Hi All
Well Mikes Websites gone down again apparently its not on that server anymore not a good sign by the looks of it
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The Blues man

Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s
Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2


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  #19  
Old 24th July 2008, 06:09 PM
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pre65 pre65 is offline
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Default Re: Millenium 4-20 (Maplin Electronics)

Quote:
Originally Posted by pre65 View Post
I had trouble with Mikes web site so i e-mailed him and it seems the address has changed slightly.

This link works

http://livinginthepast.demonweb.co.uk/valveaudio.html
Hi-this IS the correct link,but Mike has got to re-load the information and it may not be usable again before Wednesday 30th July.


Philip
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  #20  
Old 24th July 2008, 07:09 PM
colin.hepburn colin.hepburn is offline
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Default Re: Millenium 4-20 (Maplin Electronics)

Hi Philip

Thanks for that info on mikes website hoping to get some bits from him soon
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Turntable Rega 3 custom RB250 with ortofon 2M Blue /other goldring 1042 /WD phono2 /WD CF pre custom converted /WD psu2 /home built JE Labs Single Ended 6SL7/KT66/Speakers Frugal horns Mk1s
Other turntables AR EB101/Thorns TD150mk2/Thorns TD160mk2


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